homework_04_dagger_di

app/build.gradle

@@ -41,4 +41,8 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
     implementation 'com.google.dagger:dagger:2.38.1'
     kapt 'com.google.dagger:dagger-compiler:2.38.1'
-}
+
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
+}

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     package="ru.otus.daggerhomework">
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
@@ -19,4 +20,4 @@
         </activity>
     </application>
 
-</manifest>
+</manifest>

app/src/main/java/ru/otus/daggerhomework/App.kt

@@ -1,6 +1,18 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import ru.otus.daggerhomework.di.ApplicationComponent
 
-class App :Application() {
-}
+class App : Application() {
+
+    private var appComponent: ApplicationComponent? = null
+
+    override fun onCreate() {
+        super.onCreate()
+        appComponent = ApplicationComponent.create(this)
+    }
+
+    fun getAppComponent() = appComponent ?: ApplicationComponent.create(this).also {
+        appComponent = it
+    }
+}

app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt

@@ -2,19 +2,19 @@ package ru.otus.daggerhomework
 
 import android.graphics.Color
 import androidx.annotation.ColorInt
-import androidx.annotation.ColorRes
-import java.util.*
+import java.util.Random
+import javax.inject.Inject
 
 interface ColorGenerator {
 
     @ColorInt
     fun generateColor(): Int
 }
 
-class ColorGeneratorImpl : ColorGenerator {
+class ColorGeneratorImpl @Inject constructor() : ColorGenerator {
 
     override fun generateColor(): Int {
         val rnd = Random()
         return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/FlowObserver.kt

@@ -0,0 +1,13 @@
+package ru.otus.daggerhomework
+
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+interface FlowObserver<T> {
+
+    val valueFlow: Flow<T>
+
+    suspend fun emitValue(value: T)
+}

app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt

@@ -6,21 +6,35 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.di.FragmentProducerComponent
 
 class FragmentProducer : Fragment() {
 
+    private lateinit var viewModel: ViewModelProducer
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
+        return inflater.inflate(R.layout.fragment_a, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
+        val fragmentProducerComponent = FragmentProducerComponent.create(requireActivity())
+        viewModel = ViewModelProvider(viewModelStore, fragmentProducerComponent.getViewModelProducerFactory())
+            .get(ViewModelProducer::class.java)
+
         view.findViewById<Button>(R.id.button).setOnClickListener {
             //отправить результат через livedata в другой фрагмент
+            viewLifecycleOwner.lifecycleScope.launch {
+                viewModel.generateColor()
+            }
         }
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt

@@ -4,28 +4,44 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.Button
 import androidx.annotation.ColorInt
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.di.FragmentReceiverComponent
 
 class FragmentReceiver : Fragment() {
 
     private lateinit var frame: View
+    private lateinit var viewModel: ViewModelReceiver
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
+        return inflater.inflate(R.layout.fragment_b, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         frame = view.findViewById(R.id.frame)
+
+        val fragmentReceiverComponent = FragmentReceiverComponent.create(requireActivity())
+
+        viewModel = ViewModelProvider(viewModelStore, fragmentReceiverComponent.getViewModelReceiverFactory())
+            .get(ViewModelReceiver::class.java)
+
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewModel.color.collect {
+                populateColor(it)
+            }
+        }
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/IntFlowObserver.kt

@@ -0,0 +1,19 @@
+package ru.otus.daggerhomework
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import javax.inject.Inject
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+class IntFlowObserver @Inject constructor() : FlowObserver<Int> {
+
+    private val eventFlow = MutableSharedFlow<Int>()
+
+    override val valueFlow: Flow<Int> = eventFlow
+
+    override suspend fun emitValue(value: Int) {
+        eventFlow.emit(value)
+    }
+}

app/src/main/java/ru/otus/daggerhomework/MainActivity.kt

@@ -1,11 +1,25 @@
 package ru.otus.daggerhomework
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import ru.otus.daggerhomework.di.MainActivityComponent
+import ru.otus.daggerhomework.di.MainActivityComponentProvider
+
+class MainActivity : AppCompatActivity(), MainActivityComponentProvider {
+
+    private var mainActivityComponent: MainActivityComponent? = null
 
-class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        supportFragmentManager.beginTransaction()
+            .add(R.id.receiverFragment, FragmentReceiver())
+            .add(R.id.producerFragment, FragmentProducer())
+            .commit()
+    }
+
+    override fun getMainActivityComponent() = mainActivityComponent ?: MainActivityComponent.create(this).also {
+        mainActivityComponent = it
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt

@@ -1,19 +1,20 @@
 package ru.otus.daggerhomework
 
-import android.app.Activity
 import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
-import java.lang.RuntimeException
 
 class ViewModelProducer(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    private val flowObserver: FlowObserver<Int>,
+    private val context: Context,
 ) : ViewModel() {
 
-    fun generateColor() {
+    suspend fun generateColor() {
+        flowObserver.emitValue(colorGenerator.generateColor())
+
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
-        Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        Toast.makeText(context, "Color sent", Toast.LENGTH_SHORT).show()
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelProducerFactory.kt

@@ -0,0 +1,21 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import ru.otus.daggerhomework.di.ActivityContext
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+class ViewModelProducerFactory(
+    private val colorGenerator: ColorGenerator,
+    private val flowObserver: FlowObserver<Int>,
+    @ActivityContext private val context: Context
+) : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+        return ViewModelProducer(colorGenerator, flowObserver, context) as T
+    }
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt

@@ -3,16 +3,34 @@ package ru.otus.daggerhomework
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
-import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
-import java.lang.RuntimeException
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.di.AppContext
 
 class ViewModelReceiver(
-    private val context: Context
+    private val flowObserver: FlowObserver<Int>,
+    @AppContext private val context: Context
 ) : ViewModel() {
 
-    fun observeColors() {
-        if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
-        Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+    private val colorFlow = MutableSharedFlow<Int>()
+    val color: Flow<Int> = colorFlow
+
+    init {
+        observeColors()
+    }
+
+    private fun observeColors() {
+        viewModelScope.launch {
+            flowObserver.valueFlow.collect {
+                colorFlow.emit(it)
+
+                if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
+                Toast.makeText(context, "Color received", Toast.LENGTH_SHORT).show()
+            }
+        }
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelReceiverFactory.kt

@@ -0,0 +1,20 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import ru.otus.daggerhomework.di.AppContext
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+class ViewModelReceiverFactory(
+    private val flowObserver: FlowObserver<Int>,
+    @AppContext private val context: Context
+) : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+        return ViewModelReceiver(flowObserver, context) as T
+    }
+}

app/src/main/java/ru/otus/daggerhomework/di/ActivityContext.kt

@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Qualifier
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityContext

app/src/main/java/ru/otus/daggerhomework/di/ActivityScope.kt

@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Scope
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityScope

app/src/main/java/ru/otus/daggerhomework/di/AppContext.kt

@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Qualifier
+
+/**
+ * @author Юрий Польщиков on 08.08.2021
+ */
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class AppContext